engleski

Synthesis of Al-doped ZnO nanoparticles by pulsed laser ablation in water medium

Al-doped ZnO and pure ZnO colloidal particles were synthesized by a pulsed laser ablation in water (laser ablation in liquids, LAL). Experiments were performed systematically by changing a variety of experimental conditions like target type (pure ZnO and ZnO doped with 2 wt. % of Al2O3), type of water (MilliQ and deionized water), number of applied laser pulses, laser output energy, and laser pulse wavelength with the aim to affect the particle size, their composition and band gap. The ZnO particles properties were studied using different techniques like grazing-incidence x- ray diffraction (XRD), scanning electron microscopy (SEM), optical microscopy and energy-dispersive x-ray spectroscopy. XRD patterns of formed particles show that for all experimental conditions correspond to ZnO. SEM investigation of colloidal particles revealed that the formed particles are 20-30 nm thick discs with diameter of 100-1400 nm. It is explained by efficient particle growth through diffusion process which take place in spatially restricted volume of the target crater. The diameter of the particles does not depend on any other experimental conditions except on type of water. When laser ablation takes place in deionized water synthesized particles have mesh-like structure with sparse number of disc- like particles. It is found that both absorbance and volume of ablated craters depend linearly on number of applied laser pulses and asymptotically on laser energy. It was found that LAL appeared as efficient and versatile technique for synthesis of ZnO and Al-doped ZnO nanoparticles.

Al-dopen ZnO nanoparticles ; laser ablation in water

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